ZIP code profile · 2024 county data
ZIP Code 63303
St. Charles County, Missouri: Census demographics for this ZIP plus the containing county's FBI UCR crime rate.
Data updated 2026-08-24
- 47,285
- Population (ZIP)
- 0
- Violent rate /100K (county)
- 0
- Property rate /100K (county)
Is ZIP code 63303 safe? Honest data snapshot
ZIP code 63303 sits within St. Charles County, MO, in which law-enforcement agencies did not report complete 2024 data to the FBI UCR Program. The county figures below cover only the agencies that submitted, so they are not a measure of crime in this area and no comparison to the national average is drawn from them.
ZIP 63303 carries a Census-reported population of 47,285, ranking #5 of 14 ZIPs in St. Charles County, spread across 19.75 square miles (about 2,394 people per square mile). For a full breakdown of St. Charles County's crime categories and year-over-year trend, see the St. Charles County crime page linked below.
ZIP 63303 has no FBI-native crime rate (postal codes are not police jurisdictions). Figures above use the St. Charles County proxy where reported; see methodology for the ZCTA plurality map. Methodology.
ZIP 63303 Census context
These are ZIP/ZCTA demographic estimates, separate from the county-level FBI proxy above. They describe the local settlement, not a crime rate.
- Median household income
- $94,658
- Median age
- 40.8 years
- Owner-occupied homes
- 74%
- Occupied homes
- 20,664
Source: U.S. Census Bureau, ACS 2022 5-year ZCTA estimates (income, age, and occupied housing tenure).
ZIP 63303 settlement vs St. Charles County
ZIP 63303 itself is about 2,394 people per Census sq mi across 19.8 sq mi (47,285 residents), a postal settlement fact independent of the county UCR proxy.
ZIP 63303 accounts for roughly 11.7% of the county reporting population (47,285 of 405,262).
St. Charles County's 2024 UCR book concentrates in aggravated assault (100% of 1 offenses; mix index 10,000). ZIP 63303 inherits that county mix, not a postal-native split.
Settlement lines use Census ZCTA figures only; incomplete county agency coverage blocks any UCR mix or rate desk for this ZIP.
Nationwide peers for ZIP 63303
Similar county violent rate (~0/100K)
- ZIP 40214, KY · 0.3/100K · Jefferson County
- ZIP 07011, NJ · 0.2/100K · Passaic County
- ZIP 17543, PA · 0.2/100K · Lancaster County
- ZIP 18042, PA · 0.3/100K · Northampton County
Similar Census population (~47,285)
- ZIP 95136, CA · 47,294 pop · Δ9
- ZIP 21043, MD · 47,309 pop · Δ24
- ZIP 90016, CA · 47,309 pop · Δ24
- ZIP 77539, TX · 47,240 pop · Δ45
County detail: St. Charles County · State atlas: Missouri
Sources: U.S. Census Bureau (ZIP population, land area, 2020 ZCTA-to-county relationship file, ACS 5-year estimates) and FBI Uniform Crime Reporting (UCR) Program, Crime in the United States (CIUS) Table 10 (county-level crime, attributed via ZIP-to-county crosswalk).
Verify with Census.gov Geography and FBI.gov UCR.
Read our methodology , how this data is sourced, computed, and verified.
Every figure on PlainCrime is rendered directly from FBI Uniform Crime Reporting (UCR) source data, no number is typed in by an editor. This page combines Census ZIP-level figures with a ZIP-to-county crosswalk to attribute FBI UCR crime data honestly, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.